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In the present investigation six soybean genotypes (Giza 82, Giza 22, Giza 83, Giza 21, Giza 35 and Giza 111) were planted under natural infection with cotton leaf worm. Each genotype was divided to three groups (control, methyl jasmonate and sodium nitroprusside). Great variations between genotypes were found in response to infestation with cotton leaf worm. Giza 22 and Giza 82 were found to be the susceptible genotypes, Giza 21 and Giza 83 was the moderate genotypes while, Giza 35 and Giza 111 were the resistant genotypes. Also, the treated groups showed a significant increase in the morphological criteria and some physiological parameters such as (pigment, total soluble protein, total soluble sugar, amino acids, proline, phenols, flavonoids, tannins, total lipid, glycolipid, phospholipid, enzymatic antioxidants and non enzymatic antioxidants). On the other hand lipid peroxidation and H2O2 were decreased significantly in response to MeJA and SNP treated plants as comparing to untreated plants. Also, seeds fatty acids showed a great change in treated plants comparing with the untreated plants. MeJA and SNP treated plants showed an increase in C18:2 and C18:3 fatty acids and decreasing in C16:0 and C16:1 content. Retro markers data showed a genetically differences between soybean resistant and susceptible cultivars.
Key words: enzymatic and non enzymatic antioxidant, flavonoids, hydrogen peroxide, leaf worm, lipid peroxidation, methyl jasmonate, phenol, sodium nitroprusside, soybean and tannins.